08-10 SS Turbocharged General Discussion Discuss the 2008 - 2009 Chevy Cobalt SS Turbocharged. On sale since the second quarter of 2008.

P0100 code again

Old Oct 28, 2011 | 01:18 PM
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From: pittsburgh
P0100 code again

2009 SS/TC 28k on the car as of today

been throwing the code for some time, weird this is i have zero boost issues and no drivability issues idles smooth etc. just annoying code/

I'm thinking a wire was rubbed or pulled out of the ecu

and the intake is back to stock etc. anyone know how to test the wiring? i also cleaned the maf sensor, nothing changed. code comes back on 2nd start. every time about 4 sec after engine is running... also reset the ecu and did the battery thing.
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Old Oct 28, 2011 | 01:45 PM
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From: Kathmandu
Your choices are:

1) Boost leak test. See my sig for link. It really does sound like a vac leak to me.
2) Buy some MAF cleaner and clean the MAF. (nvm, I see you already did this)
3) Buy a new MAF sensor and try that or switch out with a buddy if you know someone else with a turbalt.
4) Check the MAF connector for pulled wiring or a pulled pin in the connector. Replace connector if damaged.
5) Replace the ECM. This is the last-ditch effort.
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Old Oct 28, 2011 | 01:57 PM
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From: pittsburgh
Originally Posted by SSlobalt
Your choices are:

1) Boost leak test. See my sig for link. It really does sound like a vac leak to me.
2) Buy some MAF cleaner and clean the MAF. (nvm, I see you already did this)
3) Buy a new MAF sensor and try that or switch out with a buddy if you know someone else with a turbalt.
4) Check the MAF connector for pulled wiring or a pulled pin in the connector. Replace connector if damaged.
5) Replace the ECM. This is the last-ditch effort.
thanks for the tips

but if its a boost leak my car wouldn't boost at all right? my car is boosting like it did when i bought it 15psi

and the connector looks fine no wires pulled...
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Old Oct 28, 2011 | 02:07 PM
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From: Frederick MD
Originally Posted by bspeed
thanks for the tips

but if its a boost leak my car wouldn't boost at all right? my car is boosting like it did when i bought it 15psi

and the connector looks fine no wires pulled...

99% of the time it will. That being siad you are the 99% that makes up the 1% that it doesn't! (follow that?) It could just be a small leak/lose hose/pinhole/piece of dirt...I would make sure when you cleaned the MAF you didn't break anything. Make sure it's still looks good. dont want to break the sensor!
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